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The SI-111, manufactured by Apogee, is a precision infrared radiometer that determines the surface temperature of an object without physical contact. It measures both the subject's surface temperature and the sensor-body temperature. A Campbell Scientific data logger uses these measurements to calculate the correct temperature of the subject.
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The SI-111 consists of a thermopile, which measures surface temperature, and a thermistor, which measures sensor body temperature. The two temperature sensors are housed in a rugged aluminum body that contains a germanium window.
Both the thermopile and the thermistor output a millivolt signal that most of our data loggers can measure. The data logger uses the Stefan-Boltzman equation to correct for the effect of sensor body temperature on the target temperature. The corrected readings yield an absolute accuracy of ±0.2°C from -10° to +65°C.
The SI-111 has a 22-degree half-angle field-of-view (FOV). The FOV is reported as the half-angle of the apex of the cone formed by the target (cone base) and the detector (cone apex). The target is a circle from which 98% of the radiation viewed by the detector is being emitted.
Note: Prior to November 2008, the SI-111 was named the IRR-P.
| Input Power | 2.5 V excitation (for thermistor) |
| Response Time | < 1 s (to changes in target temperature) |
| Target Temperature Output Signal | 60 μV per °C difference from sensor body |
| Body Temperature Output Signal | 0 to 2500 mV |
| Optics | Germanium lens |
| Wavelength Range | 8 to 14 μm (corresponds to atmospheric window) |
| Field of View (FOV) | 22° half angle |
| Operating Temperature Range | -55° to +80°C |
| Operating Relative Humidity Range | 0 to 100% RH |
| Cable Description | 4.5 m (14.76 ft) twisted, shielded 4-conductor wire with Santoprene casing, ending in pigtails |
| Absolute Accuracy |
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| Uniformity |
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| Repeatability |
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| Diameter | 2.3 cm (0.9 in.) |
| Length | 6 cm (2.4 in.) |
| Weight | 190 g (6.7 oz) |
注意: 以下は代表的な互換性情報を示しています。互換性のある製品や互換性のない製品をすべて網羅したリストではありません。
| 製品 | 互換性 | 注意 |
|---|---|---|
| 21X (リタイア) | ||
| CR10 (リタイア) | ||
| CR1000 (リタイア) | ||
| CR10X (リタイア) | ||
| CR200X (リタイア) | ||
| CR206X (リタイア) | ||
| CR211X (リタイア) | ||
| CR216X (リタイア) | ||
| CR23X (リタイア) | ||
| CR295X (リタイア) | ||
| CR300 (リタイア) | ||
| CR3000 (リタイア) | ||
| CR310 | ||
| CR500 (リタイア) | ||
| CR5000 (リタイア) | ||
| CR510 (リタイア) | ||
| CR6 | ||
| CR800 (リタイア) | ||
| CR850 (リタイア) | ||
| CR9000 (リタイア) | ||
| CR9000X (リタイア) |
The SI-111 is often fastened to a CM200-series crossarm, a tripod or tower mast, or a user-supplied pole using a CM230, CM230XL, or CM220 mount. The CM230 and CM230XL are adjustable inclination mounts that allow the SI-111 to be mounted perpendicular to the target surface when the target surface is on an incline. The CM230XL is similar to the CM230, but the CM230XL places the SI-111 further from the pole or crossarm. The SI-111 may also be attached directly to a user-supplied camera tripod.
SI-111に関するよくある質問の数: 8
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There are two accuracy specifications listed for the SI-111:
Using a radiation shield with the sensor helps keep the sensor body temperature in close approximation to the ambient air temperature. Ultimately, the need to protect the sensor from short-wave radiation is dependent on what is being measured and under what conditions. For example, Campbell Scientific recommends using a radiation shield for canopy measurements.
As a general recommendation, recalibration should be done every two years.
The SI-111 has been successfully calibrated with a maximum cable length of 100 m without a loss in accuracy. Ideally, the sensor is calibrated with the overall cable length already configured. Our tests have shown, however, that adding a few meters of cable in the field has a negligible effect on the calibration, provided the measurement device has significantly high input impedance, such as with the CR1000.
The window in the Apogee infrared sensor is inset and protected, but it can become partially blocked in three ways:
Clean the inner threads and sensor window using a cotton swab dipped in the appropriate solvent. For additional cleaning information, see the Maintenance section of the instruction manual.
The SI-111 can be used to measure a wide variety of surfaces, including water and snow. When measuring objects with low emissivity, however, it is particularly important to apply corrections to the measurement.
キャリブレーション シートに含まれる情報は、センサごとに異なります。一部のセンサでは、シートにデータロガーをプログラムするために必要な係数が含まれています。その他のセンサでは、キャリブレーション シートは合格/不合格レポートです。
これは、キャリブレーション シートに含まれる情報によって異なります。
IR 放射の損失のため、ほぼすべてのサーモパイル計器には通常、負のオフセットがあります。このオフセットは夜間に最も目立ち、ゼロではなく小さな負の値が読み取られます。この同じオフセットは日中にも存在しますが、太陽信号が大きいため目立ちません。
もう 1 つの一般的な問題は、計器の水平調整です。サーモパイル計器の水平調整では、コサイン応答が正しくないため、直接ビーム成分にエラーが発生する可能性があります。太陽が地平線に近い場合、角度が非常に浅いため、これらのエラーはより顕著になります。
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